Narayano,

If this was my problem, my approach to solving it would be...

1. I tried 70 bpm and it seemed like it was twice as fast as it should be.

2. This leads me to try 35 bpm (just as you did) and I found that this was too slow.

3. So now let's try halfway between 70 and 35 (that is, (70+35)/2 = 53 bpm).

4. If 53 bpm turned out to be too slow, then I'd try the tempo midway between 70 and 53 (that is, (70 + 53)/2 = 62 bpm)

5. If, on the other hand, 53 turned out to be too fast, then I'd try the tempo midway between 35 and 53 (i.e. (53+35)/2 = 44 bpm)

Sooner or later, I would home in on the tempo that suits.


Alternatively...

The "trial and error" approach is always a good technique too and well suited to this problem.

Once I'd found that 70 was too fast and 35 was too slow, I'd start increasing the tempo from 35 upwards. To speed up the process, I'd increase in increments of 10 bpm.

For example...

Since 35 is too slow, I'd try 45 bpm as my next test tempo. If that is still too slow, I'd then try 55 bpm. If 45 bpm was just a little too fast, though, I'd come back 5 to 40 bpm and give that a test run. I'd continue on like this until I have the tempo I want.

Hope this helps.

Regards,
Noel

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